SU1700233A1 - Device for determination of rock mass impact-hazardous condition - Google Patents

Abstract

The invention relates to the control of rock pressure and is intended for local measurements in the face of a mine or quarry to prevent rock blow. The goal is to increase the reliability of the determination of the shock-hazardous state of a mountain massif under conditions of a high disturbance background. For this, the device containing the recorder 7 and the geophone 1 and amplifier 2 connected in series are additionally equipped with three adaptive frequency filters 3, three setters 5 and six comparators 4 and 6. shots, shocks, micro-blows and shocks with an energy of 102-106 J, the second is dynamic damage, accompanied by the formation of cracks of the order of 0.1 m, leading to the formation of acoustic waves with energy — J, the third — acoustic events with energy - 10 J. The filter outputs are connected in pairs to the first and second inputs of the comparators. The outputs of the comparators 4 are connected to the first inputs of the comparators b, the second inputs of which are connected to the outputs of the setters 5. The outputs of the comparators 6 are connected to the inputs of the recorder 7, through which you can monitor the dynamics of the rock mass. 1 il. cl

Description

The invention relates to the control of rock pressure and can be used for local measurements in the face of a mine or quarry to prevent rock blow.

The aim of the invention is to improve the reliability of determining the shock hazard of a mountain range under conditions of high disturbance background.

The drawing shows a block diagram of a device for determining the shock hazard of a rock massif.

The device contains a geophone 1, amplifier 2, three adaptive frequency filters 3,

Three first comparators 4, three dials 5, three second comparators 6, recorder 7. At the same time, the input of amplifier 2 is connected to the output of geophone 1, the inputs of adaptive frequency filters 3 are registered to the output of amplifier 2: booms, jolts, micro shocks and beats with energy 10 -10 J; second, dynamic damages, C9, which are accompanied by the formation of cracks of the order of 0.1 m, leading to the formation of acoustic waves with an energy of 102 J; the third - acoustic events with energy - 10 J. The outputs of which are pairwise connected to

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the first and second inputs of the first comparators 4, the first inputs of the second comparators 6 are connected to the outputs of the first comparators 4, the second inputs of the second comparators 6 are connected to the outputs of the controllers 5, and the outputs of the second comparators 6 are connected to the inputs of the recorder 7.

The device works as follows. Signals from a seismic emission source in a stressed mountain range are fed to geophone 1, where they are converted into electrical ones, amplified by amplifier 2, decomposed by adaptive frequency filters 3 into three bands: above 3 kHz, from 3 to 100 Hz, below 100 Hz because seismic events with energies of 102–106 J have a frequency spectrum below 100 Hz: acoustic events with J energies have a frequency spectrum of 100–2000 Hz; acoustic events with energies - J have a frequency spectrum of 2000–20000 Hz.

In each filter 3, in turn, the signal is decomposed into three or more subbands, a signal average value is determined over a range, and subbands with a significant excess of this value, i.e. those affected by interference are excluded from further consideration.

The average values of the levels of the three bands without taking into account the areas affected by interference come in pairs from the adaptive frequency filters 3 to the first comparators 4 to determine the ratios to the average levels of the first and second, second and third, third and first ranges, 2 2, Cs. The resulting ratios are fed to the second comparators 6 for comparison with

norm К, К§, К§, installed on sensor 5 after preliminary study of the mountain massif, which with a certain degree of probability correspond to three categories of shock hazard:

K8 - increased danger of manifestations of rock bursts, category I;

K - dangerous for the manifestation of a mountain strike, II category;

K - does not represent a direct danger of manifestation of rock bursts, category III.

Second comparators 6 results

Comparisons Ki / K, Ka / K5, KZ / KZ are sent to recorder 7 to monitor the dynamics of the behavior of the mountain range.

The increase in the low-frequency component of the short-circuit / short-circuit is also indicated by an increase in the danger of rock bursts, and

A short / short 1 recorder signals that it is necessary to take urgent measures to prevent the undesirable consequences of a possible mining strike.

Thus, a comparative analysis

With the help of additionally introduced elements of different parts of the spectrum, the signal allows extracting additional information for transmission to the recorder, i.e. allows to increase the reliability of determining the shock-hazardous state of the mountain massif.

Claims (1)

Apparatus of the Invention A device for determining the shock hazard of a rock mass containing a logger and sequentially A connected geophone, amplifier, characterized in that, in order to increase reliability, three adaptive frequency filters, three first comparators, three adjusters, three second comparators, the amplifier output is connected to the adaptive frequency filter inputs, the adaptive frequency filter outputs are connected in pairs to the first and second inputs of the first comparators, whose outputs are connected to the first inputs of the second comparators, the second inputs of the last connected to the outputs for the sensors, and the outputs of the second comparators are connected to the first, second and third inputs of the recorder.